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The Origin of the Bifurcation in the Sagittarius Stream
Open accessAbstract
The latest Sloan Digital Sky Survey data reveal a prominent bifurcation in the distribution of debris of the Sagittarius dwarf spheroidal (Sgr) beginning at a right ascension of α ≈ 190 ° . Two branches of the stream (A and B) persist at roughly the same heliocentric distance over at least 50° of arc. There is also evidence for a more distant structure (C) well behind the A branch. This paper provides the first explanation for the bifurcation. It is caused by the projection of the young leading (A) and old trailing (B) tidal arms of the Sgr, while the old leading arm (C) lies well behind A. This explanation is only possible if the halo is close to spherical, as the angular difference between the branches is a measure of the precession of the orbital plane.
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Cites
The Two Micron All Sky Survey (2MASS)
Skrutskie, M. F., Cutri, R. M., Stiening, R., Weinberg, M. D., Schneider, S., Carpenter, J. M., Beichman, C., Capps, R., Chester, T., Elias, J., et al. (2006) · The Astronomical Journal · doi:10.1086/498708 · Cited by 12,019
Astrometric Calibration of the Sloan Digital Sky Survey
Pier, J. R., Munn, J. A., Hindsley, R. B., Hennessy, G. S., Kent, S. M., Lupton, R. H., & Ivezić, Ž. (2003) · The Astronomical Journal · doi:10.1086/346138 · Cited by 908
Cited by
THE SAGITTARIUS DWARF GALAXY: A MODEL FOR EVOLUTION IN A TRIAXIAL MILKY WAY HALO
Law, D. R., & Majewski, S. R. (2010) · The Astrophysical Journal · doi:10.1088/0004-637x/714/1/229 · Cited by 550
The total mass of the Large Magellanic Cloud from its perturbation on the Orphan stream
Erkal, D., Belokurov, V, Laporte, C. F. P., Koposov, S. E., Li, T. S., Grillmair, C. J., Kallivayalil, N., Price-Whelan, A. M., Evans, N. W., Hawkins, K., et al. (2019) · Monthly Notices of the Royal Astronomical Society · doi:10.1093/mnras/stz1371 · Cited by 357
Self-citationAccreted versus in situ Milky Way globular clusters
Forbes, D. A., & Bridges, T. (2010) · Monthly Notices of the Royal Astronomical Society · doi:10.1111/j.1365-2966.2010.16373.x · Cited by 310
Substructure revealed by RR Lyraes in SDSS Stripe 82
Watkins, L. L., Evans, N. W., Belokurov, V., Smith, M. C., Hewett, P. C., Bramich, D. M., Gilmore, G. F., Irwin, M. J., Vidrih, S., Wyrzykowski, Ł., et al. (2009) · Monthly Notices of the Royal Astronomical Society · doi:10.1111/j.1365-2966.2009.15242.x · Cited by 273
Self-citationIs the SMC Bound to the LMC? The Hubble Space Telescope Proper Motion of the SMC
Kallivayalil, N., van der Marel, R. P., & Alcock, C. (2006) · The Astrophysical Journal · doi:10.1086/508014 · Cited by 270
Metadata
- Authors
- Fellhauer, M., Belokurov, V., Evans, N. W., Wilkinson, M. I., Zucker, D. B., Gilmore, G., Irwin, M. J., Bramich, D. M., Vidrih, S., Wyse, R. F. G., Beers, T. C., & Brinkmann, J.
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 2006-11
- Volume
- 651
- Issue
- 1
- Pages
- 167-173
- ISSN
- 0004-637X (ISSN-L)
- 1538-4357
- OpenAlex
- W2146714816
- Cited by
- 243
- References
- 2
- FWCI
- 12.34
- Type
- journal article
- Language
- en
- Open access
- bronze
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- Fellhauer, M., Belokurov, V., Evans, N. W., Wilkinson, M. I., Zucker, D. B., Gilmore, G., Irwin, M. J., Bramich, D. M., Vidrih, S., Wyse, R. F. G., Beers, T. C., & Brinkmann, J. (2006). The Origin of the Bifurcation in the Sagittarius Stream. The Astrophysical Journal. https://doi.org/10.1086/507128
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